BASEL, Switzerland — Roche Holding AG will pay $3.1 billion for Ventana Medical Systems Inc., in a sweetened deal that finally won over the Tucson-based maker of drug-testing instruments. The deal fell into place after Roche raised its offer to $89.50 from $75 per share, the Swiss company said Tuesday.

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Boulder County 4-H officials prohibited a gun display as an addition to this year’s annual tack show Feb. 24 at the Boulder County Fairgrounds just hours before 15-year-old 4-H member Tegan Brown told leaders she would not attend the event if firearms were present.

McDonald’s Happy Meal is about to get a makeover. On Thursday, the fast-food chain announced new nutrition standards for its kids’ meals and a series of upcoming menu swaps designed to make options for children healthier.

It happens in so many workplaces — two colleagues begin a romantic relationship. But a heightened awareness about sexual harassment means small business owners can get more anxious when employees start dating.